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Answer Wiki. The ionic charge of oxygen is -2. You can tell because oxygen is in group number 6, so it has 6 valence electrons. Since it needs 2 more electrons to become neutral with a full outer shell of 8 electrons, its charge is -2 (since adding electrons gives a negative charge).
The sulfate polyatomic ion has 1 sulfur atom and 4 oxygen atoms, with an overall charge of -2. According to Rule 5, oxygen has an oxidation number of -2 in this compound. We have 4 oxygen atoms, each with an oxidation number of -2, so the overall charge from oxygen is -8.